Implemented FileTypeDetector to return contentType from Metadata

src/main/java/com/upplication/s3fs/S3FileTypeDetector.java

@@ -0,0 +1,21 @@
+package com.upplication.s3fs;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.spi.FileTypeDetector;
+
+import com.amazonaws.services.s3.model.ObjectMetadata;
+import com.upplication.s3fs.util.S3Utils;
+
+public class S3FileTypeDetector extends FileTypeDetector {
+	@Override
+	public String probeContentType(Path path) throws IOException {
+		if (path instanceof S3Path) {
+			S3Path s3Path = (S3Path) path;
+			ObjectMetadata metadata = S3Utils.getObjectMetadata(s3Path);
+			if (metadata != null)
+				return metadata.getContentType();
+		}
+		return null;
+	}
+}

src/main/java/com/upplication/s3fs/util/S3Utils.java

@@ -21,6 +21,20 @@
  */
 public class S3Utils {
 
+	public static ObjectMetadata getObjectMetadata(S3Path s3Path) {
+		String key = s3Path.getKey();
+		String bucketName = s3Path.getFileStore().name();
+		AmazonS3 client = s3Path.getFileSystem().getClient();
+		// try to find the element with the current key (maybe with end slash or maybe not.)
+		try {
+			return client.getObjectMetadata(bucketName, key);
+		} catch (AmazonS3Exception e) {
+			if (e.getStatusCode() != 404)
+				throw e;
+		}
+		return null;
+	}
+
     /**
      * Get the {@link S3ObjectSummary} that represent this Path or her first child if this path not exists
      *

src/main/resources/META-INF/services/java.nio.file.spi.FileTypeDetector

@@ -0,0 +1 @@
+com.upplication.s3fs.S3FileTypeDetector